﻿/*  Prototype JavaScript framework, version 1.6.0.3
*  (c) 2005-2008 Sam Stephenson
*
*  Prototype is freely distributable under the terms of an MIT-style license.
*  For details, see the Prototype web site: http://www.prototypejs.org/
*
*--------------------------------------------------------------------------*/

var Prototype = {
	Version: '1.6.0.3',

	Browser: {
		IE: !!(window.attachEvent &&
      navigator.userAgent.indexOf('Opera') === -1),
		Opera: navigator.userAgent.indexOf('Opera') > -1,
		WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
		Gecko: navigator.userAgent.indexOf('Gecko') > -1 &&
      navigator.userAgent.indexOf('KHTML') === -1,
		MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
	},

	BrowserFeatures: {
		XPath: !!document.evaluate,
		SelectorsAPI: !!document.querySelector,
		ElementExtensions: !!window.HTMLElement,
		SpecificElementExtensions:
      document.createElement('div')['__proto__'] &&
      document.createElement('div')['__proto__'] !==
        document.createElement('form')['__proto__']
	},

	ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
	JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

	emptyFunction: function() { },
	K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
	Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
	create: function() {
		var parent = null, properties = $A(arguments);
		if (Object.isFunction(properties[0]))
			parent = properties.shift();

		function klass() {
			this.initialize.apply(this, arguments);
		}

		Object.extend(klass, Class.Methods);
		klass.superclass = parent;
		klass.subclasses = [];

		if (parent) {
			var subclass = function() { };
			subclass.prototype = parent.prototype;
			klass.prototype = new subclass;
			parent.subclasses.push(klass);
		}

		for (var i = 0; i < properties.length; i++)
			klass.addMethods(properties[i]);

		if (!klass.prototype.initialize)
			klass.prototype.initialize = Prototype.emptyFunction;

		klass.prototype.constructor = klass;

		return klass;
	}
};

Class.Methods = {
	addMethods: function(source) {
		var ancestor = this.superclass && this.superclass.prototype;
		var properties = Object.keys(source);

		if (!Object.keys({ toString: true }).length)
			properties.push("toString", "valueOf");

		for (var i = 0, length = properties.length; i < length; i++) {
			var property = properties[i], value = source[property];
			if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super") {
				var method = value;
				value = (function(m) {
					return function() { return ancestor[m].apply(this, arguments) };
				})(property).wrap(method);

				value.valueOf = method.valueOf.bind(method);
				value.toString = method.toString.bind(method);
			}
			this.prototype[property] = value;
		}

		return this;
	}
};

var Abstract = {};

Object.extend = function(destination, source) {
	for (var property in source)
		destination[property] = source[property];
	return destination;
};

Object.extend(Object, {
	inspect: function(object) {
		try {
			if (Object.isUndefined(object)) return 'undefined';
			if (object === null) return 'null';
			return object.inspect ? object.inspect() : String(object);
		} catch (e) {
			if (e instanceof RangeError) return '...';
			throw e;
		}
	},

	toJSON: function(object) {
		var type = typeof object;
		switch (type) {
			case 'undefined':
			case 'function':
			case 'unknown': return;
			case 'boolean': return object.toString();
		}

		if (object === null) return 'null';
		if (object.toJSON) return object.toJSON();
		if (Object.isElement(object)) return;

		var results = [];
		for (var property in object) {
			var value = Object.toJSON(object[property]);
			if (!Object.isUndefined(value))
				results.push(property.toJSON() + ': ' + value);
		}

		return '{' + results.join(', ') + '}';
	},

	toQueryString: function(object) {
		return $H(object).toQueryString();
	},

	toHTML: function(object) {
		return object && object.toHTML ? object.toHTML() : String.interpret(object);
	},

	keys: function(object) {
		var keys = [];
		for (var property in object)
			keys.push(property);
		return keys;
	},

	values: function(object) {
		var values = [];
		for (var property in object)
			values.push(object[property]);
		return values;
	},

	clone: function(object) {
		return Object.extend({}, object);
	},

	isElement: function(object) {
		return !!(object && object.nodeType == 1);
	},

	isArray: function(object) {
		return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
	},

	isHash: function(object) {
		return object instanceof Hash;
	},

	isFunction: function(object) {
		return typeof object == "function";
	},

	isString: function(object) {
		return typeof object == "string";
	},

	isNumber: function(object) {
		return typeof object == "number";
	},

	isUndefined: function(object) {
		return typeof object == "undefined";
	}
});

Object.extend(Function.prototype, {
	argumentNames: function() {
		var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
      .replace(/\s+/g, '').split(',');
		return names.length == 1 && !names[0] ? [] : names;
	},

	bind: function() {
		if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
		var __method = this, args = $A(arguments), object = args.shift();
		return function() {
			return __method.apply(object, args.concat($A(arguments)));
		}
	},

	bindAsEventListener: function() {
		var __method = this, args = $A(arguments), object = args.shift();
		return function(event) {
			return __method.apply(object, [event || window.event].concat(args));
		}
	},

	curry: function() {
		if (!arguments.length) return this;
		var __method = this, args = $A(arguments);
		return function() {
			return __method.apply(this, args.concat($A(arguments)));
		}
	},

	delay: function() {
		var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
		return window.setTimeout(function() {
			return __method.apply(__method, args);
		}, timeout);
	},

	defer: function() {
		var args = [0.01].concat($A(arguments));
		return this.delay.apply(this, args);
	},

	wrap: function(wrapper) {
		var __method = this;
		return function() {
			return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
		}
	},

	methodize: function() {
		if (this._methodized) return this._methodized;
		var __method = this;
		return this._methodized = function() {
			return __method.apply(null, [this].concat($A(arguments)));
		};
	}
});

Date.prototype.toJSON = function() {
	return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
	these: function() {
		var returnValue;

		for (var i = 0, length = arguments.length; i < length; i++) {
			var lambda = arguments[i];
			try {
				returnValue = lambda();
				break;
			} catch (e) { }
		}

		return returnValue;
	}
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
	return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
	initialize: function(callback, frequency) {
		this.callback = callback;
		this.frequency = frequency;
		this.currentlyExecuting = false;

		this.registerCallback();
	},

	registerCallback: function() {
		this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
	},

	execute: function() {
		this.callback(this);
	},

	stop: function() {
		if (!this.timer) return;
		clearInterval(this.timer);
		this.timer = null;
	},

	onTimerEvent: function() {
		if (!this.currentlyExecuting) {
			try {
				this.currentlyExecuting = true;
				this.execute();
			} finally {
				this.currentlyExecuting = false;
			}
		}
	}
});
Object.extend(String, {
	interpret: function(value) {
		return value == null ? '' : String(value);
	},
	specialChar: {
		'\b': '\\b',
		'\t': '\\t',
		'\n': '\\n',
		'\f': '\\f',
		'\r': '\\r',
		'\\': '\\\\'
	}
});

Object.extend(String.prototype, {
	gsub: function(pattern, replacement) {
		var result = '', source = this, match;
		replacement = arguments.callee.prepareReplacement(replacement);

		while (source.length > 0) {
			if (match = source.match(pattern)) {
				result += source.slice(0, match.index);
				result += String.interpret(replacement(match));
				source = source.slice(match.index + match[0].length);
			} else {
				result += source, source = '';
			}
		}
		return result;
	},

	sub: function(pattern, replacement, count) {
		replacement = this.gsub.prepareReplacement(replacement);
		count = Object.isUndefined(count) ? 1 : count;

		return this.gsub(pattern, function(match) {
			if (--count < 0) return match[0];
			return replacement(match);
		});
	},

	scan: function(pattern, iterator) {
		this.gsub(pattern, iterator);
		return String(this);
	},

	truncate: function(length, truncation) {
		length = length || 30;
		truncation = Object.isUndefined(truncation) ? '...' : truncation;
		return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
	},

	strip: function() {
		return this.replace(/^\s+/, '').replace(/\s+$/, '');
	},

	stripTags: function() {
		return this.replace(/<\/?[^>]+>/gi, '');
	},

	stripScripts: function() {
		return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
	},

	extractScripts: function() {
		var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
		var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
		return (this.match(matchAll) || []).map(function(scriptTag) {
			return (scriptTag.match(matchOne) || ['', ''])[1];
		});
	},

	evalScripts: function() {
		return this.extractScripts().map(function(script) { return eval(script) });
	},

	escapeHTML: function() {
		var self = arguments.callee;
		self.text.data = this;
		return self.div.innerHTML;
	},

	unescapeHTML: function() {
		var div = new Element('div');
		div.innerHTML = this.stripTags();
		return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo + node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
	},

	toQueryParams: function(separator) {
		var match = this.strip().match(/([^?#]*)(#.*)?$/);
		if (!match) return {};

		return match[1].split(separator || '&').inject({}, function(hash, pair) {
			if ((pair = pair.split('='))[0]) {
				var key = decodeURIComponent(pair.shift());
				var value = pair.length > 1 ? pair.join('=') : pair[0];
				if (value != undefined) value = decodeURIComponent(value);

				if (key in hash) {
					if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
					hash[key].push(value);
				}
				else hash[key] = value;
			}
			return hash;
		});
	},

	toArray: function() {
		return this.split('');
	},

	succ: function() {
		return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
	},

	times: function(count) {
		return count < 1 ? '' : new Array(count + 1).join(this);
	},

	camelize: function() {
		var parts = this.split('-'), len = parts.length;
		if (len == 1) return parts[0];

		var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

		for (var i = 1; i < len; i++)
			camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

		return camelized;
	},

	capitalize: function() {
		return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
	},

	underscore: function() {
		return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/, '#{1}_#{2}').gsub(/([a-z\d])([A-Z])/, '#{1}_#{2}').gsub(/-/, '_').toLowerCase();
	},

	dasherize: function() {
		return this.gsub(/_/, '-');
	},

	inspect: function(useDoubleQuotes) {
		var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
			var character = String.specialChar[match[0]];
			return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
		});
		if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
		return "'" + escapedString.replace(/'/g, '\\\'') + "'";
	},

	toJSON: function() {
		return this.inspect(true);
	},

	unfilterJSON: function(filter) {
		return this.sub(filter || Prototype.JSONFilter, '#{1}');
	},

	isJSON: function() {
		var str = this;
		if (str.blank()) return false;
		str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
		return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
	},

	evalJSON: function(sanitize) {
		var json = this.unfilterJSON();
		try {
			if (!sanitize || json.isJSON()) return eval('(' + json + ')');
		} catch (e) { }
		throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
	},

	include: function(pattern) {
		return this.indexOf(pattern) > -1;
	},

	startsWith: function(pattern) {
		return this.indexOf(pattern) === 0;
	},

	endsWith: function(pattern) {
		var d = this.length - pattern.length;
		return d >= 0 && this.lastIndexOf(pattern) === d;
	},

	empty: function() {
		return this == '';
	},

	blank: function() {
		return /^\s*$/.test(this);
	},

	interpolate: function(object, pattern) {
		return new Template(this, pattern).evaluate(object);
	}
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
	escapeHTML: function() {
		return this.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
	},
	unescapeHTML: function() {
		return this.stripTags().replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>');
	}
});

String.prototype.gsub.prepareReplacement = function(replacement) {
	if (Object.isFunction(replacement)) return replacement;
	var template = new Template(replacement);
	return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
	div: document.createElement('div'),
	text: document.createTextNode('')
});

String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);

var Template = Class.create({
	initialize: function(template, pattern) {
		this.template = template.toString();
		this.pattern = pattern || Template.Pattern;
	},

	evaluate: function(object) {
		if (Object.isFunction(object.toTemplateReplacements))
			object = object.toTemplateReplacements();

		return this.template.gsub(this.pattern, function(match) {
			if (object == null) return '';

			var before = match[1] || '';
			if (before == '\\') return match[2];

			var ctx = object, expr = match[3];
			var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
			match = pattern.exec(expr);
			if (match == null) return before;

			while (match != null) {
				var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
				ctx = ctx[comp];
				if (null == ctx || '' == match[3]) break;
				expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
				match = pattern.exec(expr);
			}

			return before + String.interpret(ctx);
		});
	}
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = {};

var Enumerable = {
	each: function(iterator, context) {
		var index = 0;
		try {
			this._each(function(value) {
				iterator.call(context, value, index++);
			});
		} catch (e) {
			if (e != $break) throw e;
		}
		return this;
	},

	eachSlice: function(number, iterator, context) {
		var index = -number, slices = [], array = this.toArray();
		if (number < 1) return array;
		while ((index += number) < array.length)
			slices.push(array.slice(index, index + number));
		return slices.collect(iterator, context);
	},

	all: function(iterator, context) {
		iterator = iterator || Prototype.K;
		var result = true;
		this.each(function(value, index) {
			result = result && !!iterator.call(context, value, index);
			if (!result) throw $break;
		});
		return result;
	},

	any: function(iterator, context) {
		iterator = iterator || Prototype.K;
		var result = false;
		this.each(function(value, index) {
			if (result = !!iterator.call(context, value, index))
				throw $break;
		});
		return result;
	},

	collect: function(iterator, context) {
		iterator = iterator || Prototype.K;
		var results = [];
		this.each(function(value, index) {
			results.push(iterator.call(context, value, index));
		});
		return results;
	},

	detect: function(iterator, context) {
		var result;
		this.each(function(value, index) {
			if (iterator.call(context, value, index)) {
				result = value;
				throw $break;
			}
		});
		return result;
	},

	findAll: function(iterator, context) {
		var results = [];
		this.each(function(value, index) {
			if (iterator.call(context, value, index))
				results.push(value);
		});
		return results;
	},

	grep: function(filter, iterator, context) {
		iterator = iterator || Prototype.K;
		var results = [];

		if (Object.isString(filter))
			filter = new RegExp(filter);

		this.each(function(value, index) {
			if (filter.match(value))
				results.push(iterator.call(context, value, index));
		});
		return results;
	},

	include: function(object) {
		if (Object.isFunction(this.indexOf))
			if (this.indexOf(object) != -1) return true;

		var found = false;
		this.each(function(value) {
			if (value == object) {
				found = true;
				throw $break;
			}
		});
		return found;
	},

	inGroupsOf: function(number, fillWith) {
		fillWith = Object.isUndefined(fillWith) ? null : fillWith;
		return this.eachSlice(number, function(slice) {
			while (slice.length < number) slice.push(fillWith);
			return slice;
		});
	},

	inject: function(memo, iterator, context) {
		this.each(function(value, index) {
			memo = iterator.call(context, memo, value, index);
		});
		return memo;
	},

	invoke: function(method) {
		var args = $A(arguments).slice(1);
		return this.map(function(value) {
			return value[method].apply(value, args);
		});
	},

	max: function(iterator, context) {
		iterator = iterator || Prototype.K;
		var result;
		this.each(function(value, index) {
			value = iterator.call(context, value, index);
			if (result == null || value >= result)
				result = value;
		});
		return result;
	},

	min: function(iterator, context) {
		iterator = iterator || Prototype.K;
		var result;
		this.each(function(value, index) {
			value = iterator.call(context, value, index);
			if (result == null || value < result)
				result = value;
		});
		return result;
	},

	partition: function(iterator, context) {
		iterator = iterator || Prototype.K;
		var trues = [], falses = [];
		this.each(function(value, index) {
			(iterator.call(context, value, index) ?
        trues : falses).push(value);
		});
		return [trues, falses];
	},

	pluck: function(property) {
		var results = [];
		this.each(function(value) {
			results.push(value[property]);
		});
		return results;
	},

	reject: function(iterator, context) {
		var results = [];
		this.each(function(value, index) {
			if (!iterator.call(context, value, index))
				results.push(value);
		});
		return results;
	},

	sortBy: function(iterator, context) {
		return this.map(function(value, index) {
			return {
				value: value,
				criteria: iterator.call(context, value, index)
			};
		}).sort(function(left, right) {
			var a = left.criteria, b = right.criteria;
			return a < b ? -1 : a > b ? 1 : 0;
		}).pluck('value');
	},

	toArray: function() {
		return this.map();
	},

	zip: function() {
		var iterator = Prototype.K, args = $A(arguments);
		if (Object.isFunction(args.last()))
			iterator = args.pop();

		var collections = [this].concat(args).map($A);
		return this.map(function(value, index) {
			return iterator(collections.pluck(index));
		});
	},

	size: function() {
		return this.toArray().length;
	},

	inspect: function() {
		return '#<Enumerable:' + this.toArray().inspect() + '>';
	}
};

Object.extend(Enumerable, {
	map: Enumerable.collect,
	find: Enumerable.detect,
	select: Enumerable.findAll,
	filter: Enumerable.findAll,
	member: Enumerable.include,
	entries: Enumerable.toArray,
	every: Enumerable.all,
	some: Enumerable.any
});
function $A(iterable) {
	if (!iterable) return [];
	if (iterable.toArray) return iterable.toArray();
	var length = iterable.length || 0, results = new Array(length);
	while (length--) results[length] = iterable[length];
	return results;
}

if (Prototype.Browser.WebKit) {
	$A = function(iterable) {
		if (!iterable) return [];
		// In Safari, only use the `toArray` method if it's not a NodeList.
		// A NodeList is a function, has an function `item` property, and a numeric
		// `length` property. Adapted from Google Doctype.
		if (!(typeof iterable === 'function' && typeof iterable.length ===
        'number' && typeof iterable.item === 'function') && iterable.toArray)
			return iterable.toArray();
		var length = iterable.length || 0, results = new Array(length);
		while (length--) results[length] = iterable[length];
		return results;
	};
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
	_each: function(iterator) {
		for (var i = 0, length = this.length; i < length; i++)
			iterator(this[i]);
	},

	clear: function() {
		this.length = 0;
		return this;
	},

	first: function() {
		return this[0];
	},

	last: function() {
		return this[this.length - 1];
	},

	compact: function() {
		return this.select(function(value) {
			return value != null;
		});
	},

	flatten: function() {
		return this.inject([], function(array, value) {
			return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
		});
	},

	without: function() {
		var values = $A(arguments);
		return this.select(function(value) {
			return !values.include(value);
		});
	},

	reverse: function(inline) {
		return (inline !== false ? this : this.toArray())._reverse();
	},

	reduce: function() {
		return this.length > 1 ? this : this[0];
	},

	uniq: function(sorted) {
		return this.inject([], function(array, value, index) {
			if (0 == index || (sorted ? array.last() != value : !array.include(value)))
				array.push(value);
			return array;
		});
	},

	intersect: function(array) {
		return this.uniq().findAll(function(item) {
			return array.detect(function(value) { return item === value });
		});
	},

	clone: function() {
		return [].concat(this);
	},

	size: function() {
		return this.length;
	},

	inspect: function() {
		return '[' + this.map(Object.inspect).join(', ') + ']';
	},

	toJSON: function() {
		var results = [];
		this.each(function(object) {
			var value = Object.toJSON(object);
			if (!Object.isUndefined(value)) results.push(value);
		});
		return '[' + results.join(', ') + ']';
	}
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
	Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
	i || (i = 0);
	var length = this.length;
	if (i < 0) i = length + i;
	for (; i < length; i++)
		if (this[i] === item) return i;
	return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
	i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
	var n = this.slice(0, i).reverse().indexOf(item);
	return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
	if (!Object.isString(string)) return [];
	string = string.strip();
	return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera) {
	Array.prototype.concat = function() {
		var array = [];
		for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
		for (var i = 0, length = arguments.length; i < length; i++) {
			if (Object.isArray(arguments[i])) {
				for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
					array.push(arguments[i][j]);
			} else {
				array.push(arguments[i]);
			}
		}
		return array;
	};
}
Object.extend(Number.prototype, {
	toColorPart: function() {
		return this.toPaddedString(2, 16);
	},

	succ: function() {
		return this + 1;
	},

	times: function(iterator, context) {
		$R(0, this, true).each(iterator, context);
		return this;
	},

	toPaddedString: function(length, radix) {
		var string = this.toString(radix || 10);
		return '0'.times(length - string.length) + string;
	},

	toJSON: function() {
		return isFinite(this) ? this.toString() : 'null';
	}
});

$w('abs round ceil floor').each(function(method) {
	Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
	return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

	function toQueryPair(key, value) {
		if (Object.isUndefined(value)) return key;
		return key + '=' + encodeURIComponent(String.interpret(value));
	}

	return {
		initialize: function(object) {
			this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
		},

		_each: function(iterator) {
			for (var key in this._object) {
				var value = this._object[key], pair = [key, value];
				pair.key = key;
				pair.value = value;
				iterator(pair);
			}
		},

		set: function(key, value) {
			return this._object[key] = value;
		},

		get: function(key) {
			// simulating poorly supported hasOwnProperty
			if (this._object[key] !== Object.prototype[key])
				return this._object[key];
		},

		unset: function(key) {
			var value = this._object[key];
			delete this._object[key];
			return value;
		},

		toObject: function() {
			return Object.clone(this._object);
		},

		keys: function() {
			return this.pluck('key');
		},

		values: function() {
			return this.pluck('value');
		},

		index: function(value) {
			var match = this.detect(function(pair) {
				return pair.value === value;
			});
			return match && match.key;
		},

		merge: function(object) {
			return this.clone().update(object);
		},

		update: function(object) {
			return new Hash(object).inject(this, function(result, pair) {
				result.set(pair.key, pair.value);
				return result;
			});
		},

		toQueryString: function() {
			return this.inject([], function(results, pair) {
				var key = encodeURIComponent(pair.key), values = pair.value;

				if (values && typeof values == 'object') {
					if (Object.isArray(values))
						return results.concat(values.map(toQueryPair.curry(key)));
				} else results.push(toQueryPair(key, values));
				return results;
			}).join('&');
		},

		inspect: function() {
			return '#<Hash:{' + this.map(function(pair) {
				return pair.map(Object.inspect).join(': ');
			}).join(', ') + '}>';
		},

		toJSON: function() {
			return Object.toJSON(this.toObject());
		},

		clone: function() {
			return new Hash(this);
		}
	}
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
	initialize: function(start, end, exclusive) {
		this.start = start;
		this.end = end;
		this.exclusive = exclusive;
	},

	_each: function(iterator) {
		var value = this.start;
		while (this.include(value)) {
			iterator(value);
			value = value.succ();
		}
	},

	include: function(value) {
		if (value < this.start)
			return false;
		if (this.exclusive)
			return value < this.end;
		return value <= this.end;
	}
});

var $R = function(start, end, exclusive) {
	return new ObjectRange(start, end, exclusive);
};

var Ajax = {
	getTransport: function() {
		return Try.these(
      function() { return new XMLHttpRequest() },
      function() { return new ActiveXObject('Msxml2.XMLHTTP') },
      function() { return new ActiveXObject('Microsoft.XMLHTTP') }
    ) || false;
	},

	activeRequestCount: 0
};

Ajax.Responders = {
	responders: [],

	_each: function(iterator) {
		this.responders._each(iterator);
	},

	register: function(responder) {
		if (!this.include(responder))
			this.responders.push(responder);
	},

	unregister: function(responder) {
		this.responders = this.responders.without(responder);
	},

	dispatch: function(callback, request, transport, json) {
		this.each(function(responder) {
			if (Object.isFunction(responder[callback])) {
				try {
					responder[callback].apply(responder, [request, transport, json]);
				} catch (e) { }
			}
		});
	}
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
	onCreate: function() { Ajax.activeRequestCount++ },
	onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
	initialize: function(options) {
		this.options = {
			method: 'post',
			asynchronous: true,
			contentType: 'application/x-www-form-urlencoded',
			encoding: 'UTF-8',
			parameters: '',
			evalJSON: true,
			evalJS: true
		};
		Object.extend(this.options, options || {});

		this.options.method = this.options.method.toLowerCase();

		if (Object.isString(this.options.parameters))
			this.options.parameters = this.options.parameters.toQueryParams();
		else if (Object.isHash(this.options.parameters))
			this.options.parameters = this.options.parameters.toObject();
	}
});

Ajax.Request = Class.create(Ajax.Base, {
	_complete: false,

	initialize: function($super, url, options) {
		$super(options);
		this.transport = Ajax.getTransport();
		this.request(url);
	},

	request: function(url) {
		this.url = url;
		this.method = this.options.method;
		var params = Object.clone(this.options.parameters);

		if (!['get', 'post'].include(this.method)) {
			// simulate other verbs over post
			params['_method'] = this.method;
			this.method = 'post';
		}

		this.parameters = params;

		if (params = Object.toQueryString(params)) {
			// when GET, append parameters to URL
			if (this.method == 'get')
				this.url += (this.url.include('?') ? '&' : '?') + params;
			else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
				params += '&_=';
		}

		try {
			var response = new Ajax.Response(this);
			if (this.options.onCreate) this.options.onCreate(response);
			Ajax.Responders.dispatch('onCreate', this, response);

			this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

			if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

			this.transport.onreadystatechange = this.onStateChange.bind(this);
			this.setRequestHeaders();

			this.body = this.method == 'post' ? (this.options.postBody || params) : null;
			this.transport.send(this.body);

			/* Force Firefox to handle ready state 4 for synchronous requests */
			if (!this.options.asynchronous && this.transport.overrideMimeType)
				this.onStateChange();

		}
		catch (e) {
			this.dispatchException(e);
		}
	},

	onStateChange: function() {
		var readyState = this.transport.readyState;
		if (readyState > 1 && !((readyState == 4) && this._complete))
			this.respondToReadyState(this.transport.readyState);
	},

	setRequestHeaders: function() {
		var headers = {
			'X-Requested-With': 'XMLHttpRequest',
			'X-Prototype-Version': Prototype.Version,
			'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
		};

		if (this.method == 'post') {
			headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

			/* Force "Connection: close" for older Mozilla browsers to work
			* around a bug where XMLHttpRequest sends an incorrect
			* Content-length header. See Mozilla Bugzilla #246651.
			*/
			if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0, 2005])[1] < 2005)
				headers['Connection'] = 'close';
		}

		// user-defined headers
		if (typeof this.options.requestHeaders == 'object') {
			var extras = this.options.requestHeaders;

			if (Object.isFunction(extras.push))
				for (var i = 0, length = extras.length; i < length; i += 2)
				headers[extras[i]] = extras[i + 1];
			else
				$H(extras).each(function(pair) { headers[pair.key] = pair.value });
		}

		for (var name in headers)
			this.transport.setRequestHeader(name, headers[name]);
	},

	success: function() {
		var status = this.getStatus();
		return !status || (status >= 200 && status < 300);
	},

	getStatus: function() {
		try {
			return this.transport.status || 0;
		} catch (e) { return 0 }
	},

	respondToReadyState: function(readyState) {
		var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

		if (state == 'Complete') {
			try {
				this._complete = true;
				(this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
			} catch (e) {
				this.dispatchException(e);
			}

			var contentType = response.getHeader('Content-type');
			if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
				this.evalResponse();
		}

		try {
			(this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
			Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
		} catch (e) {
			this.dispatchException(e);
		}

		if (state == 'Complete') {
			// avoid memory leak in MSIE: clean up
			this.transport.onreadystatechange = Prototype.emptyFunction;
		}
	},

	isSameOrigin: function() {
		var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
		return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
			protocol: location.protocol,
			domain: document.domain,
			port: location.port ? ':' + location.port : ''
		}));
	},

	getHeader: function(name) {
		try {
			return this.transport.getResponseHeader(name) || null;
		} catch (e) { return null }
	},

	evalResponse: function() {
		try {
			return eval((this.transport.responseText || '').unfilterJSON());
		} catch (e) {
			this.dispatchException(e);
		}
	},

	dispatchException: function(exception) {
		(this.options.onException || Prototype.emptyFunction)(this, exception);
		Ajax.Responders.dispatch('onException', this, exception);
	}
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
	initialize: function(request) {
		this.request = request;
		var transport = this.transport = request.transport,
        readyState = this.readyState = transport.readyState;

		if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
			this.status = this.getStatus();
			this.statusText = this.getStatusText();
			this.responseText = String.interpret(transport.responseText);
			this.headerJSON = this._getHeaderJSON();
		}

		if (readyState == 4) {
			var xml = transport.responseXML;
			this.responseXML = Object.isUndefined(xml) ? null : xml;
			this.responseJSON = this._getResponseJSON();
		}
	},

	status: 0,
	statusText: '',

	getStatus: Ajax.Request.prototype.getStatus,

	getStatusText: function() {
		try {
			return this.transport.statusText || '';
		} catch (e) { return '' }
	},

	getHeader: Ajax.Request.prototype.getHeader,

	getAllHeaders: function() {
		try {
			return this.getAllResponseHeaders();
		} catch (e) { return null }
	},

	getResponseHeader: function(name) {
		return this.transport.getResponseHeader(name);
	},

	getAllResponseHeaders: function() {
		return this.transport.getAllResponseHeaders();
	},

	_getHeaderJSON: function() {
		var json = this.getHeader('X-JSON');
		if (!json) return null;
		json = decodeURIComponent(escape(json));
		try {
			return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
		} catch (e) {
			this.request.dispatchException(e);
		}
	},

	_getResponseJSON: function() {
		var options = this.request.options;
		if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
			return null;
		try {
			return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
		} catch (e) {
			this.request.dispatchException(e);
		}
	}
});

Ajax.Updater = Class.create(Ajax.Request, {
	initialize: function($super, container, url, options) {
		this.container = {
			success: (container.success || container),
			failure: (container.failure || (container.success ? null : container))
		};

		options = Object.clone(options);
		var onComplete = options.onComplete;
		options.onComplete = (function(response, json) {
			this.updateContent(response.responseText);
			if (Object.isFunction(onComplete)) onComplete(response, json);
		}).bind(this);

		$super(url, options);
	},

	updateContent: function(responseText) {
		var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

		if (!options.evalScripts) responseText = responseText.stripScripts();

		if (receiver = $(receiver)) {
			if (options.insertion) {
				if (Object.isString(options.insertion)) {
					var insertion = {}; insertion[options.insertion] = responseText;
					receiver.insert(insertion);
				}
				else options.insertion(receiver, responseText);
			}
			else receiver.update(responseText);
		}
	}
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
	initialize: function($super, container, url, options) {
		$super(options);
		this.onComplete = this.options.onComplete;

		this.frequency = (this.options.frequency || 2);
		this.decay = (this.options.decay || 1);

		this.updater = {};
		this.container = container;
		this.url = url;

		this.start();
	},

	start: function() {
		this.options.onComplete = this.updateComplete.bind(this);
		this.onTimerEvent();
	},

	stop: function() {
		this.updater.options.onComplete = undefined;
		clearTimeout(this.timer);
		(this.onComplete || Prototype.emptyFunction).apply(this, arguments);
	},

	updateComplete: function(response) {
		if (this.options.decay) {
			this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

			this.lastText = response.responseText;
		}
		this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
	},

	onTimerEvent: function() {
		this.updater = new Ajax.Updater(this.container, this.url, this.options);
	}
});
function $(element) {
	if (arguments.length > 1) {
		for (var i = 0, elements = [], length = arguments.length; i < length; i++)
			elements.push($(arguments[i]));
		return elements;
	}
	if (Object.isString(element))
		element = document.getElementById(element);
	return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
	document._getElementsByXPath = function(expression, parentElement) {
		var results = [];
		var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
		for (var i = 0, length = query.snapshotLength; i < length; i++)
			results.push(Element.extend(query.snapshotItem(i)));
		return results;
	};
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = {};

if (!Node.ELEMENT_NODE) {
	// DOM level 2 ECMAScript Language Binding
	Object.extend(Node, {
		ELEMENT_NODE: 1,
		ATTRIBUTE_NODE: 2,
		TEXT_NODE: 3,
		CDATA_SECTION_NODE: 4,
		ENTITY_REFERENCE_NODE: 5,
		ENTITY_NODE: 6,
		PROCESSING_INSTRUCTION_NODE: 7,
		COMMENT_NODE: 8,
		DOCUMENT_NODE: 9,
		DOCUMENT_TYPE_NODE: 10,
		DOCUMENT_FRAGMENT_NODE: 11,
		NOTATION_NODE: 12
	});
}

(function() {
	var element = this.Element;
	this.Element = function(tagName, attributes) {
		attributes = attributes || {};
		tagName = tagName.toLowerCase();
		var cache = Element.cache;
		if (Prototype.Browser.IE && attributes.name) {
			tagName = '<' + tagName + ' name="' + attributes.name + '">';
			delete attributes.name;
			return Element.writeAttribute(document.createElement(tagName), attributes);
		}
		if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
		return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
	};
	Object.extend(this.Element, element || {});
	if (element) this.Element.prototype = element.prototype;
}).call(window);

Element.cache = {};

Element.Methods = {
	visible: function(element) {
		return $(element).style.display != 'none';
	},

	toggle: function(element) {
		element = $(element);
		Element[Element.visible(element) ? 'hide' : 'show'](element);
		return element;
	},

	hide: function(element) {
		element = $(element);
		element.style.display = 'none';
		return element;
	},

	show: function(element) {
		element = $(element);
		element.style.display = '';
		return element;
	},

	remove: function(element) {
		element = $(element);
		element.parentNode.removeChild(element);
		return element;
	},

	update: function(element, content) {
		element = $(element);
		if (content && content.toElement) content = content.toElement();
		if (Object.isElement(content)) return element.update().insert(content);
		content = Object.toHTML(content);
		element.innerHTML = content.stripScripts();
		content.evalScripts.bind(content).defer();
		return element;
	},

	replace: function(element, content) {
		element = $(element);
		if (content && content.toElement) content = content.toElement();
		else if (!Object.isElement(content)) {
			content = Object.toHTML(content);
			var range = element.ownerDocument.createRange();
			range.selectNode(element);
			content.evalScripts.bind(content).defer();
			content = range.createContextualFragment(content.stripScripts());
		}
		element.parentNode.replaceChild(content, element);
		return element;
	},

	insert: function(element, insertions) {
		element = $(element);

		if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
			insertions = { bottom: insertions };

		var content, insert, tagName, childNodes;

		for (var position in insertions) {
			content = insertions[position];
			position = position.toLowerCase();
			insert = Element._insertionTranslations[position];

			if (content && content.toElement) content = content.toElement();
			if (Object.isElement(content)) {
				insert(element, content);
				continue;
			}

			content = Object.toHTML(content);

			tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

			childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

			if (position == 'top' || position == 'after') childNodes.reverse();
			childNodes.each(insert.curry(element));

			content.evalScripts.bind(content).defer();
		}

		return element;
	},

	wrap: function(element, wrapper, attributes) {
		element = $(element);
		if (Object.isElement(wrapper))
			$(wrapper).writeAttribute(attributes || {});
		else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
		else wrapper = new Element('div', wrapper);
		if (element.parentNode)
			element.parentNode.replaceChild(wrapper, element);
		wrapper.appendChild(element);
		return wrapper;
	},

	inspect: function(element) {
		element = $(element);
		var result = '<' + element.tagName.toLowerCase();
		$H({ 'id': 'id', 'className': 'class' }).each(function(pair) {
			var property = pair.first(), attribute = pair.last();
			var value = (element[property] || '').toString();
			if (value) result += ' ' + attribute + '=' + value.inspect(true);
		});
		return result + '>';
	},

	recursivelyCollect: function(element, property) {
		element = $(element);
		var elements = [];
		while (element = element[property])
			if (element.nodeType == 1)
			elements.push(Element.extend(element));
		return elements;
	},

	ancestors: function(element) {
		return $(element).recursivelyCollect('parentNode');
	},

	descendants: function(element) {
		return $(element).select("*");
	},

	firstDescendant: function(element) {
		element = $(element).firstChild;
		while (element && element.nodeType != 1) element = element.nextSibling;
		return $(element);
	},

	immediateDescendants: function(element) {
		if (!(element = $(element).firstChild)) return [];
		while (element && element.nodeType != 1) element = element.nextSibling;
		if (element) return [element].concat($(element).nextSiblings());
		return [];
	},

	previousSiblings: function(element) {
		return $(element).recursivelyCollect('previousSibling');
	},

	nextSiblings: function(element) {
		return $(element).recursivelyCollect('nextSibling');
	},

	siblings: function(element) {
		element = $(element);
		return element.previousSiblings().reverse().concat(element.nextSiblings());
	},

	match: function(element, selector) {
		if (Object.isString(selector))
			selector = new Selector(selector);
		return selector.match($(element));
	},

	up: function(element, expression, index) {
		element = $(element);
		if (arguments.length == 1) return $(element.parentNode);
		var ancestors = element.ancestors();
		return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
	},

	down: function(element, expression, index) {
		element = $(element);
		if (arguments.length == 1) return element.firstDescendant();
		return Object.isNumber(expression) ? element.descendants()[expression] :
      Element.select(element, expression)[index || 0];
	},

	previous: function(element, expression, index) {
		element = $(element);
		if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
		var previousSiblings = element.previousSiblings();
		return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
	},

	next: function(element, expression, index) {
		element = $(element);
		if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
		var nextSiblings = element.nextSiblings();
		return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
	},

	select: function() {
		var args = $A(arguments), element = $(args.shift());
		return Selector.findChildElements(element, args);
	},

	adjacent: function() {
		var args = $A(arguments), element = $(args.shift());
		return Selector.findChildElements(element.parentNode, args).without(element);
	},

	identify: function(element) {
		element = $(element);
		var id = element.readAttribute('id'), self = arguments.callee;
		if (id) return id;
		do { id = 'anonymous_element_' + self.counter++ } while ($(id));
		element.writeAttribute('id', id);
		return id;
	},

	readAttribute: function(element, name) {
		element = $(element);
		if (Prototype.Browser.IE) {
			var t = Element._attributeTranslations.read;
			if (t.values[name]) return t.values[name](element, name);
			if (t.names[name]) name = t.names[name];
			if (name.include(':')) {
				return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
			}
		}
		return element.getAttribute(name);
	},

	writeAttribute: function(element, name, value) {
		element = $(element);
		var attributes = {}, t = Element._attributeTranslations.write;

		if (typeof name == 'object') attributes = name;
		else attributes[name] = Object.isUndefined(value) ? true : value;

		for (var attr in attributes) {
			name = t.names[attr] || attr;
			value = attributes[attr];
			if (t.values[attr]) name = t.values[attr](element, value);
			if (value === false || value === null)
				element.removeAttribute(name);
			else if (value === true)
				element.setAttribute(name, name);
			else element.setAttribute(name, value);
		}
		return element;
	},

	getHeight: function(element) {
		return $(element).getDimensions().height;
	},

	getWidth: function(element) {
		return $(element).getDimensions().width;
	},

	classNames: function(element) {
		return new Element.ClassNames(element);
	},

	hasClassName: function(element, className) {
		if (!(element = $(element))) return;
		var elementClassName = element.className;
		return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
	},

	addClassName: function(element, className) {
		if (!(element = $(element))) return;
		if (!element.hasClassName(className))
			element.className += (element.className ? ' ' : '') + className;
		return element;
	},

	removeClassName: function(element, className) {
		if (!(element = $(element))) return;
		element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
		return element;
	},

	toggleClassName: function(element, className) {
		if (!(element = $(element))) return;
		return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
	},

	// removes whitespace-only text node children
	cleanWhitespace: function(element) {
		element = $(element);
		var node = element.firstChild;
		while (node) {
			var nextNode = node.nextSibling;
			if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
				element.removeChild(node);
			node = nextNode;
		}
		return element;
	},

	empty: function(element) {
		return $(element).innerHTML.blank();
	},

	descendantOf: function(element, ancestor) {
		element = $(element), ancestor = $(ancestor);

		if (element.compareDocumentPosition)
			return (element.compareDocumentPosition(ancestor) & 8) === 8;

		if (ancestor.contains)
			return ancestor.contains(element) && ancestor !== element;

		while (element = element.parentNode)
			if (element == ancestor) return true;

		return false;
	},

	scrollTo: function(element) {
		element = $(element);
		var pos = element.cumulativeOffset();
		window.scrollTo(pos[0], pos[1]);
		return element;
	},

	getStyle: function(element, style) {
		element = $(element);
		style = style == 'float' ? 'cssFloat' : style.camelize();
		var value = element.style[style];
		if (!value || value == 'auto') {
			var css = document.defaultView.getComputedStyle(element, null);
			value = css ? css[style] : null;
		}
		if (style == 'opacity') return value ? parseFloat(value) : 1.0;
		return value == 'auto' ? null : value;
	},

	getOpacity: function(element) {
		return $(element).getStyle('opacity');
	},

	setStyle: function(element, styles) {
		element = $(element);
		var elementStyle = element.style, match;
		if (Object.isString(styles)) {
			element.style.cssText += ';' + styles;
			return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
		}
		for (var property in styles)
			if (property == 'opacity') element.setOpacity(styles[property]);
		else
			elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

		return element;
	},

	setOpacity: function(element, value) {
		element = $(element);
		element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
		return element;
	},

	getDimensions: function(element) {
		element = $(element);
		var display = element.getStyle('display');
		if (display != 'none' && display != null) // Safari bug
			return { width: element.offsetWidth, height: element.offsetHeight };

		// All *Width and *Height properties give 0 on elements with display none,
		// so enable the element temporarily
		var els = element.style;
		var originalVisibility = els.visibility;
		var originalPosition = els.position;
		var originalDisplay = els.display;
		els.visibility = 'hidden';
		els.position = 'absolute';
		els.display = 'block';
		var originalWidth = element.clientWidth;
		var originalHeight = element.clientHeight;
		els.display = originalDisplay;
		els.position = originalPosition;
		els.visibility = originalVisibility;
		return { width: originalWidth, height: originalHeight };
	},

	makePositioned: function(element) {
		element = $(element);
		var pos = Element.getStyle(element, 'position');
		if (pos == 'static' || !pos) {
			element._madePositioned = true;
			element.style.position = 'relative';
			// Opera returns the offset relative to the positioning context, when an
			// element is position relative but top and left have not been defined
			if (Prototype.Browser.Opera) {
				element.style.top = 0;
				element.style.left = 0;
			}
		}
		return element;
	},

	undoPositioned: function(element) {
		element = $(element);
		if (element._madePositioned) {
			element._madePositioned = undefined;
			element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
		}
		return element;
	},

	makeClipping: function(element) {
		element = $(element);
		if (element._overflow) return element;
		element._overflow = Element.getStyle(element, 'overflow') || 'auto';
		if (element._overflow !== 'hidden')
			element.style.overflow = 'hidden';
		return element;
	},

	undoClipping: function(element) {
		element = $(element);
		if (!element._overflow) return element;
		element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
		element._overflow = null;
		return element;
	},

	cumulativeOffset: function(element) {
		var valueT = 0, valueL = 0;
		do {
			valueT += element.offsetTop || 0;
			valueL += element.offsetLeft || 0;
			element = element.offsetParent;
		} while (element);
		return Element._returnOffset(valueL, valueT);
	},

	positionedOffset: function(element) {
		var valueT = 0, valueL = 0;
		do {
			valueT += element.offsetTop || 0;
			valueL += element.offsetLeft || 0;
			element = element.offsetParent;
			if (element) {
				if (element.tagName.toUpperCase() == 'BODY') break;
				var p = Element.getStyle(element, 'position');
				if (p !== 'static') break;
			}
		} while (element);
		return Element._returnOffset(valueL, valueT);
	},

	absolutize: function(element) {
		element = $(element);
		if (element.getStyle('position') == 'absolute') return element;
		// Position.prepare(); // To be done manually by Scripty when it needs it.

		var offsets = element.positionedOffset();
		var top = offsets[1];
		var left = offsets[0];
		var width = element.clientWidth;
		var height = element.clientHeight;

		element._originalLeft = left - parseFloat(element.style.left || 0);
		element._originalTop = top - parseFloat(element.style.top || 0);
		element._originalWidth = element.style.width;
		element._originalHeight = element.style.height;

		element.style.position = 'absolute';
		element.style.top = top + 'px';
		element.style.left = left + 'px';
		element.style.width = width + 'px';
		element.style.height = height + 'px';
		return element;
	},

	relativize: function(element) {
		element = $(element);
		if (element.getStyle('position') == 'relative') return element;
		// Position.prepare(); // To be done manually by Scripty when it needs it.

		element.style.position = 'relative';
		var top = parseFloat(element.style.top || 0) - (element._originalTop || 0);
		var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

		element.style.top = top + 'px';
		element.style.left = left + 'px';
		element.style.height = element._originalHeight;
		element.style.width = element._originalWidth;
		return element;
	},

	cumulativeScrollOffset: function(element) {
		var valueT = 0, valueL = 0;
		do {
			valueT += element.scrollTop || 0;
			valueL += element.scrollLeft || 0;
			element = element.parentNode;
		} while (element);
		return Element._returnOffset(valueL, valueT);
	},

	getOffsetParent: function(element) {
		if (element.offsetParent) return $(element.offsetParent);
		if (element == document.body) return $(element);

		while ((element = element.parentNode) && element != document.body)
			if (Element.getStyle(element, 'position') != 'static')
			return $(element);

		return $(document.body);
	},

	viewportOffset: function(forElement) {
		var valueT = 0, valueL = 0;

		var element = forElement;
		do {
			valueT += element.offsetTop || 0;
			valueL += element.offsetLeft || 0;

			// Safari fix
			if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;

		} while (element = element.offsetParent);

		element = forElement;
		do {
			if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
				valueT -= element.scrollTop || 0;
				valueL -= element.scrollLeft || 0;
			}
		} while (element = element.parentNode);

		return Element._returnOffset(valueL, valueT);
	},

	clonePosition: function(element, source) {
		var options = Object.extend({
			setLeft: true,
			setTop: true,
			setWidth: true,
			setHeight: true,
			offsetTop: 0,
			offsetLeft: 0
		}, arguments[2] || {});

		// find page position of source
		source = $(source);
		var p = source.viewportOffset();

		// find coordinate system to use
		element = $(element);
		var delta = [0, 0];
		var parent = null;
		// delta [0,0] will do fine with position: fixed elements,
		// position:absolute needs offsetParent deltas
		if (Element.getStyle(element, 'position') == 'absolute') {
			parent = element.getOffsetParent();
			delta = parent.viewportOffset();
		}

		// correct by body offsets (fixes Safari)
		if (parent == document.body) {
			delta[0] -= document.body.offsetLeft;
			delta[1] -= document.body.offsetTop;
		}

		// set position
		if (options.setLeft) element.style.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
		if (options.setTop) element.style.top = (p[1] - delta[1] + options.offsetTop) + 'px';
		if (options.setWidth) element.style.width = source.offsetWidth + 'px';
		if (options.setHeight) element.style.height = source.offsetHeight + 'px';
		return element;
	}
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
	getElementsBySelector: Element.Methods.select,
	childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
	write: {
		names: {
			className: 'class',
			htmlFor: 'for'
		},
		values: {}
	}
};

if (Prototype.Browser.Opera) {
	Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
    	switch (style) {
    		case 'left': case 'top': case 'right': case 'bottom':
    			if (proceed(element, 'position') === 'static') return null;
    		case 'height': case 'width':
    			// returns '0px' for hidden elements; we want it to return null
    			if (!Element.visible(element)) return null;

    			// returns the border-box dimensions rather than the content-box
    			// dimensions, so we subtract padding and borders from the value
    			var dim = parseInt(proceed(element, style), 10);

    			if (dim !== element['offset' + style.capitalize()])
    				return dim + 'px';

    			var properties;
    			if (style === 'height') {
    				properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
    			}
    			else {
    				properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
    			}
    			return properties.inject(dim, function(memo, property) {
    				var val = proceed(element, property);
    				return val === null ? memo : memo - parseInt(val, 10);
    			}) + 'px';
    		default: return proceed(element, style);
    	}
    }
  );

	Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute) {
    	if (attribute === 'title') return element.title;
    	return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
	// IE doesn't report offsets correctly for static elements, so we change them
	// to "relative" to get the values, then change them back.
	Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    function(proceed, element) {
    	element = $(element);
    	// IE throws an error if element is not in document
    	try { element.offsetParent }
    	catch (e) { return $(document.body) }
    	var position = element.getStyle('position');
    	if (position !== 'static') return proceed(element);
    	element.setStyle({ position: 'relative' });
    	var value = proceed(element);
    	element.setStyle({ position: position });
    	return value;
    }
  );

	$w('positionedOffset viewportOffset').each(function(method) {
		Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element) {
      	element = $(element);
      	try { element.offsetParent }
      	catch (e) { return Element._returnOffset(0, 0) }
      	var position = element.getStyle('position');
      	if (position !== 'static') return proceed(element);
      	// Trigger hasLayout on the offset parent so that IE6 reports
      	// accurate offsetTop and offsetLeft values for position: fixed.
      	var offsetParent = element.getOffsetParent();
      	if (offsetParent && offsetParent.getStyle('position') === 'fixed')
      		offsetParent.setStyle({ zoom: 1 });
      	element.setStyle({ position: 'relative' });
      	var value = proceed(element);
      	element.setStyle({ position: position });
      	return value;
      }
    );
	});

	Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
    function(proceed, element) {
    	try { element.offsetParent }
    	catch (e) { return Element._returnOffset(0, 0) }
    	return proceed(element);
    }
  );

	Element.Methods.getStyle = function(element, style) {
		element = $(element);
		style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
		var value = element.style[style];
		if (!value && element.currentStyle) value = element.currentStyle[style];

		if (style == 'opacity') {
			if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
				if (value[1]) return parseFloat(value[1]) / 100;
			return 1.0;
		}

		if (value == 'auto') {
			if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
				return element['offset' + style.capitalize()] + 'px';
			return null;
		}
		return value;
	};

	Element.Methods.setOpacity = function(element, value) {
		function stripAlpha(filter) {
			return filter.replace(/alpha\([^\)]*\)/gi, '');
		}
		element = $(element);
		var currentStyle = element.currentStyle;
		if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
			element.style.zoom = 1;

		var filter = element.getStyle('filter'), style = element.style;
		if (value == 1 || value === '') {
			(filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
			return element;
		} else if (value < 0.00001) value = 0;
		style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
		return element;
	};

	Element._attributeTranslations = {
		read: {
			names: {
				'class': 'className',
				'for': 'htmlFor'
			},
			values: {
				_getAttr: function(element, attribute) {
					return element.getAttribute(attribute, 2);
				},
				_getAttrNode: function(element, attribute) {
					var node = element.getAttributeNode(attribute);
					return node ? node.value : "";
				},
				_getEv: function(element, attribute) {
					attribute = element.getAttribute(attribute);
					return attribute ? attribute.toString().slice(23, -2) : null;
				},
				_flag: function(element, attribute) {
					return $(element).hasAttribute(attribute) ? attribute : null;
				},
				style: function(element) {
					return element.style.cssText.toLowerCase();
				},
				title: function(element) {
					return element.title;
				}
			}
		}
	};

	Element._attributeTranslations.write = {
		names: Object.extend({
			cellpadding: 'cellPadding',
			cellspacing: 'cellSpacing'
		}, Element._attributeTranslations.read.names),
		values: {
			checked: function(element, value) {
				element.checked = !!value;
			},

			style: function(element, value) {
				element.style.cssText = value ? value : '';
			}
		}
	};

	Element._attributeTranslations.has = {};

	$w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
      	Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
      	Element._attributeTranslations.has[attr.toLowerCase()] = attr;
      });

	(function(v) {
		Object.extend(v, {
			href: v._getAttr,
			src: v._getAttr,
			type: v._getAttr,
			action: v._getAttrNode,
			disabled: v._flag,
			checked: v._flag,
			readonly: v._flag,
			multiple: v._flag,
			onload: v._getEv,
			onunload: v._getEv,
			onclick: v._getEv,
			ondblclick: v._getEv,
			onmousedown: v._getEv,
			onmouseup: v._getEv,
			onmouseover: v._getEv,
			onmousemove: v._getEv,
			onmouseout: v._getEv,
			onfocus: v._getEv,
			onblur: v._getEv,
			onkeypress: v._getEv,
			onkeydown: v._getEv,
			onkeyup: v._getEv,
			onsubmit: v._getEv,
			onreset: v._getEv,
			onselect: v._getEv,
			onchange: v._getEv
		});
	})(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
	Element.Methods.setOpacity = function(element, value) {
		element = $(element);
		element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
		return element;
	};
}

else if (Prototype.Browser.WebKit) {
	Element.Methods.setOpacity = function(element, value) {
		element = $(element);
		element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

		if (value == 1)
			if (element.tagName.toUpperCase() == 'IMG' && element.width) {
			element.width++; element.width--;
		} else try {
			var n = document.createTextNode(' ');
			element.appendChild(n);
			element.removeChild(n);
		} catch (e) { }

		return element;
	};

	// Safari returns margins on body which is incorrect if the child is absolutely
	// positioned.  For performance reasons, redefine Element#cumulativeOffset for
	// KHTML/WebKit only.
	Element.Methods.cumulativeOffset = function(element) {
		var valueT = 0, valueL = 0;
		do {
			valueT += element.offsetTop || 0;
			valueL += element.offsetLeft || 0;
			if (element.offsetParent == document.body)
				if (Element.getStyle(element, 'position') == 'absolute') break;

			element = element.offsetParent;
		} while (element);

		return Element._returnOffset(valueL, valueT);
	};
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
	// IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
	Element.Methods.update = function(element, content) {
		element = $(element);

		if (content && content.toElement) content = content.toElement();
		if (Object.isElement(content)) return element.update().insert(content);

		content = Object.toHTML(content);
		var tagName = element.tagName.toUpperCase();

		if (tagName in Element._insertionTranslations.tags) {
			$A(element.childNodes).each(function(node) { element.removeChild(node) });
			Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
		}
		else element.innerHTML = content.stripScripts();

		content.evalScripts.bind(content).defer();
		return element;
	};
}

if ('outerHTML' in document.createElement('div')) {
	Element.Methods.replace = function(element, content) {
		element = $(element);

		if (content && content.toElement) content = content.toElement();
		if (Object.isElement(content)) {
			element.parentNode.replaceChild(content, element);
			return element;
		}

		content = Object.toHTML(content);
		var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

		if (Element._insertionTranslations.tags[tagName]) {
			var nextSibling = element.next();
			var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
			parent.removeChild(element);
			if (nextSibling)
				fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
			else
				fragments.each(function(node) { parent.appendChild(node) });
		}
		else element.outerHTML = content.stripScripts();

		content.evalScripts.bind(content).defer();
		return element;
	};
}

Element._returnOffset = function(l, t) {
	var result = [l, t];
	result.left = l;
	result.top = t;
	return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
	var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
	if (t) {
		div.innerHTML = t[0] + html + t[1];
		t[2].times(function() { div = div.firstChild });
	} else div.innerHTML = html;
	return $A(div.childNodes);
};

Element._insertionTranslations = {
	before: function(element, node) {
		element.parentNode.insertBefore(node, element);
	},
	top: function(element, node) {
		element.insertBefore(node, element.firstChild);
	},
	bottom: function(element, node) {
		element.appendChild(node);
	},
	after: function(element, node) {
		element.parentNode.insertBefore(node, element.nextSibling);
	},
	tags: {
		TABLE: ['<table>', '</table>', 1],
		TBODY: ['<table><tbody>', '</tbody></table>', 2],
		TR: ['<table><tbody><tr>', '</tr></tbody></table>', 3],
		TD: ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
		SELECT: ['<select>', '</select>', 1]
	}
};

(function() {
	Object.extend(this.tags, {
		THEAD: this.tags.TBODY,
		TFOOT: this.tags.TBODY,
		TH: this.tags.TD
	});
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
	hasAttribute: function(element, attribute) {
		attribute = Element._attributeTranslations.has[attribute] || attribute;
		var node = $(element).getAttributeNode(attribute);
		return !!(node && node.specified);
	}
};

Element.Methods.ByTag = {};

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div')['__proto__']) {
	window.HTMLElement = {};
	window.HTMLElement.prototype = document.createElement('div')['__proto__'];
	Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
	if (Prototype.BrowserFeatures.SpecificElementExtensions)
		return Prototype.K;

	var Methods = {}, ByTag = Element.Methods.ByTag;

	var extend = Object.extend(function(element) {
		if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;

		var methods = Object.clone(Methods),
      tagName = element.tagName.toUpperCase(), property, value;

		// extend methods for specific tags
		if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

		for (property in methods) {
			value = methods[property];
			if (Object.isFunction(value) && !(property in element))
				element[property] = value.methodize();
		}

		element._extendedByPrototype = Prototype.emptyFunction;
		return element;

	}, {
		refresh: function() {
			// extend methods for all tags (Safari doesn't need this)
			if (!Prototype.BrowserFeatures.ElementExtensions) {
				Object.extend(Methods, Element.Methods);
				Object.extend(Methods, Element.Methods.Simulated);
			}
		}
	});

	extend.refresh();
	return extend;
})();

Element.hasAttribute = function(element, attribute) {
	if (element.hasAttribute) return element.hasAttribute(attribute);
	return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
	var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

	if (!methods) {
		Object.extend(Form, Form.Methods);
		Object.extend(Form.Element, Form.Element.Methods);
		Object.extend(Element.Methods.ByTag, {
			"FORM": Object.clone(Form.Methods),
			"INPUT": Object.clone(Form.Element.Methods),
			"SELECT": Object.clone(Form.Element.Methods),
			"TEXTAREA": Object.clone(Form.Element.Methods)
		});
	}

	if (arguments.length == 2) {
		var tagName = methods;
		methods = arguments[1];
	}

	if (!tagName) Object.extend(Element.Methods, methods || {});
	else {
		if (Object.isArray(tagName)) tagName.each(extend);
		else extend(tagName);
	}

	function extend(tagName) {
		tagName = tagName.toUpperCase();
		if (!Element.Methods.ByTag[tagName])
			Element.Methods.ByTag[tagName] = {};
		Object.extend(Element.Methods.ByTag[tagName], methods);
	}

	function copy(methods, destination, onlyIfAbsent) {
		onlyIfAbsent = onlyIfAbsent || false;
		for (var property in methods) {
			var value = methods[property];
			if (!Object.isFunction(value)) continue;
			if (!onlyIfAbsent || !(property in destination))
				destination[property] = value.methodize();
		}
	}

	function findDOMClass(tagName) {
		var klass;
		var trans = {
			"OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
			"FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
			"DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
			"H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
			"INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
		};
		if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
		if (window[klass]) return window[klass];
		klass = 'HTML' + tagName + 'Element';
		if (window[klass]) return window[klass];
		klass = 'HTML' + tagName.capitalize() + 'Element';
		if (window[klass]) return window[klass];

		window[klass] = {};
		window[klass].prototype = document.createElement(tagName)['__proto__'];
		return window[klass];
	}

	if (F.ElementExtensions) {
		copy(Element.Methods, HTMLElement.prototype);
		copy(Element.Methods.Simulated, HTMLElement.prototype, true);
	}

	if (F.SpecificElementExtensions) {
		for (var tag in Element.Methods.ByTag) {
			var klass = findDOMClass(tag);
			if (Object.isUndefined(klass)) continue;
			copy(T[tag], klass.prototype);
		}
	}

	Object.extend(Element, Element.Methods);
	delete Element.ByTag;

	if (Element.extend.refresh) Element.extend.refresh();
	Element.cache = {};
};

document.viewport = {
	getDimensions: function() {
		var dimensions = {}, B = Prototype.Browser;
		$w('width height').each(function(d) {
			var D = d.capitalize();
			if (B.WebKit && !document.evaluate) {
				// Safari <3.0 needs self.innerWidth/Height
				dimensions[d] = self['inner' + D];
			} else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
				// Opera <9.5 needs document.body.clientWidth/Height
				dimensions[d] = document.body['client' + D]
			} else {
				dimensions[d] = document.documentElement['client' + D];
			}
		});
		return dimensions;
	},

	getWidth: function() {
		return this.getDimensions().width;
	},

	getHeight: function() {
		return this.getDimensions().height;
	},

	getScrollOffsets: function() {
		return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
	}
};
/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
* part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
* license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
	initialize: function(expression) {
		this.expression = expression.strip();

		if (this.shouldUseSelectorsAPI()) {
			this.mode = 'selectorsAPI';
		} else if (this.shouldUseXPath()) {
			this.mode = 'xpath';
			this.compileXPathMatcher();
		} else {
			this.mode = "normal";
			this.compileMatcher();
		}

	},

	shouldUseXPath: function() {
		if (!Prototype.BrowserFeatures.XPath) return false;

		var e = this.expression;

		// Safari 3 chokes on :*-of-type and :empty
		if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
			return false;

		// XPath can't do namespaced attributes, nor can it read
		// the "checked" property from DOM nodes
		if ((/(\[[\w-]*?:|:checked)/).test(e))
			return false;

		return true;
	},

	shouldUseSelectorsAPI: function() {
		if (!Prototype.BrowserFeatures.SelectorsAPI) return false;

		if (!Selector._div) Selector._div = new Element('div');

		// Make sure the browser treats the selector as valid. Test on an
		// isolated element to minimize cost of this check.
		try {
			Selector._div.querySelector(this.expression);
		} catch (e) {
			return false;
		}

		return true;
	},

	compileMatcher: function() {
		var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

		if (Selector._cache[e]) {
			this.matcher = Selector._cache[e];
			return;
		}

		this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

		while (e && le != e && (/\S/).test(e)) {
			le = e;
			for (var i in ps) {
				p = ps[i];
				if (m = e.match(p)) {
					this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
            new Template(c[i]).evaluate(m));
					e = e.replace(m[0], '');
					break;
				}
			}
		}

		this.matcher.push("return h.unique(n);\n}");
		eval(this.matcher.join('\n'));
		Selector._cache[this.expression] = this.matcher;
	},

	compileXPathMatcher: function() {
		var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

		if (Selector._cache[e]) {
			this.xpath = Selector._cache[e]; return;
		}

		this.matcher = ['.//*'];
		while (e && le != e && (/\S/).test(e)) {
			le = e;
			for (var i in ps) {
				if (m = e.match(ps[i])) {
					this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
					e = e.replace(m[0], '');
					break;
				}
			}
		}

		this.xpath = this.matcher.join('');
		Selector._cache[this.expression] = this.xpath;
	},

	findElements: function(root) {
		root = root || document;
		var e = this.expression, results;

		switch (this.mode) {
			case 'selectorsAPI':
				// querySelectorAll queries document-wide, then filters to descendants
				// of the context element. That's not what we want.
				// Add an explicit context to the selector if necessary.
				if (root !== document) {
					var oldId = root.id, id = $(root).identify();
					e = "#" + id + " " + e;
				}

				results = $A(root.querySelectorAll(e)).map(Element.extend);
				root.id = oldId;

				return results;
			case 'xpath':
				return document._getElementsByXPath(this.xpath, root);
			default:
				return this.matcher(root);
		}
	},

	match: function(element) {
		this.tokens = [];

		var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
		var le, p, m;

		while (e && le !== e && (/\S/).test(e)) {
			le = e;
			for (var i in ps) {
				p = ps[i];
				if (m = e.match(p)) {
					// use the Selector.assertions methods unless the selector
					// is too complex.
					if (as[i]) {
						this.tokens.push([i, Object.clone(m)]);
						e = e.replace(m[0], '');
					} else {
						// reluctantly do a document-wide search
						// and look for a match in the array
						return this.findElements(document).include(element);
					}
				}
			}
		}

		var match = true, name, matches;
		for (var i = 0, token; token = this.tokens[i]; i++) {
			name = token[0], matches = token[1];
			if (!Selector.assertions[name](element, matches)) {
				match = false; break;
			}
		}

		return match;
	},

	toString: function() {
		return this.expression;
	},

	inspect: function() {
		return "#<Selector:" + this.expression.inspect() + ">";
	}
});

Object.extend(Selector, {
	_cache: {},

	xpath: {
		descendant: "//*",
		child: "/*",
		adjacent: "/following-sibling::*[1]",
		laterSibling: '/following-sibling::*',
		tagName: function(m) {
			if (m[1] == '*') return '';
			return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
		},
		className: "[contains(concat(' ', @class, ' '), ' #{1} ')]",
		id: "[@id='#{1}']",
		attrPresence: function(m) {
			m[1] = m[1].toLowerCase();
			return new Template("[@#{1}]").evaluate(m);
		},
		attr: function(m) {
			m[1] = m[1].toLowerCase();
			m[3] = m[5] || m[6];
			return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
		},
		pseudo: function(m) {
			var h = Selector.xpath.pseudos[m[1]];
			if (!h) return '';
			if (Object.isFunction(h)) return h(m);
			return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
		},
		operators: {
			'=': "[@#{1}='#{3}']",
			'!=': "[@#{1}!='#{3}']",
			'^=': "[starts-with(@#{1}, '#{3}')]",
			'$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
			'*=': "[contains(@#{1}, '#{3}')]",
			'~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
			'|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
		},
		pseudos: {
			'first-child': '[not(preceding-sibling::*)]',
			'last-child': '[not(following-sibling::*)]',
			'only-child': '[not(preceding-sibling::* or following-sibling::*)]',
			'empty': "[count(*) = 0 and (count(text()) = 0)]",
			'checked': "[@checked]",
			'disabled': "[(@disabled) and (@type!='hidden')]",
			'enabled': "[not(@disabled) and (@type!='hidden')]",
			'not': function(m) {
				var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

				var exclusion = [];
				while (e && le != e && (/\S/).test(e)) {
					le = e;
					for (var i in p) {
						if (m = e.match(p[i])) {
							v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
							exclusion.push("(" + v.substring(1, v.length - 1) + ")");
							e = e.replace(m[0], '');
							break;
						}
					}
				}
				return "[not(" + exclusion.join(" and ") + ")]";
			},
			'nth-child': function(m) {
				return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
			},
			'nth-last-child': function(m) {
				return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
			},
			'nth-of-type': function(m) {
				return Selector.xpath.pseudos.nth("position() ", m);
			},
			'nth-last-of-type': function(m) {
				return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
			},
			'first-of-type': function(m) {
				m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
			},
			'last-of-type': function(m) {
				m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
			},
			'only-of-type': function(m) {
				var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
			},
			nth: function(fragment, m) {
				var mm, formula = m[6], predicate;
				if (formula == 'even') formula = '2n+0';
				if (formula == 'odd') formula = '2n+1';
				if (mm = formula.match(/^(\d+)$/)) // digit only
					return '[' + fragment + "= " + mm[1] + ']';
				if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
					if (mm[1] == "-") mm[1] = -1;
					var a = mm[1] ? Number(mm[1]) : 1;
					var b = mm[2] ? Number(mm[2]) : 0;
					predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
					return new Template(predicate).evaluate({
						fragment: fragment, a: a, b: b
					});
				}
			}
		}
	},

	criteria: {
		tagName: 'n = h.tagName(n, r, "#{1}", c);      c = false;',
		className: 'n = h.className(n, r, "#{1}", c);    c = false;',
		id: 'n = h.id(n, r, "#{1}", c);           c = false;',
		attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
		attr: function(m) {
			m[3] = (m[5] || m[6]);
			return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
		},
		pseudo: function(m) {
			if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
			return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
		},
		descendant: 'c = "descendant";',
		child: 'c = "child";',
		adjacent: 'c = "adjacent";',
		laterSibling: 'c = "laterSibling";'
	},

	patterns: {
		// combinators must be listed first
		// (and descendant needs to be last combinator)
		laterSibling: /^\s*~\s*/,
		child: /^\s*>\s*/,
		adjacent: /^\s*\+\s*/,
		descendant: /^\s/,

		// selectors follow
		tagName: /^\s*(\*|[\w\-]+)(\b|$)?/,
		id: /^#([\w\-\*]+)(\b|$)/,
		className: /^\.([\w\-\*]+)(\b|$)/,
		pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
		attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
		attr: /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
	},

	// for Selector.match and Element#match
	assertions: {
		tagName: function(element, matches) {
			return matches[1].toUpperCase() == element.tagName.toUpperCase();
		},

		className: function(element, matches) {
			return Element.hasClassName(element, matches[1]);
		},

		id: function(element, matches) {
			return element.id === matches[1];
		},

		attrPresence: function(element, matches) {
			return Element.hasAttribute(element, matches[1]);
		},

		attr: function(element, matches) {
			var nodeValue = Element.readAttribute(element, matches[1]);
			return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
		}
	},

	handlers: {
		// UTILITY FUNCTIONS
		// joins two collections
		concat: function(a, b) {
			for (var i = 0, node; node = b[i]; i++)
				a.push(node);
			return a;
		},

		// marks an array of nodes for counting
		mark: function(nodes) {
			var _true = Prototype.emptyFunction;
			for (var i = 0, node; node = nodes[i]; i++)
				node._countedByPrototype = _true;
			return nodes;
		},

		unmark: function(nodes) {
			for (var i = 0, node; node = nodes[i]; i++)
				node._countedByPrototype = undefined;
			return nodes;
		},

		// mark each child node with its position (for nth calls)
		// "ofType" flag indicates whether we're indexing for nth-of-type
		// rather than nth-child
		index: function(parentNode, reverse, ofType) {
			parentNode._countedByPrototype = Prototype.emptyFunction;
			if (reverse) {
				for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
					var node = nodes[i];
					if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
				}
			} else {
				for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
					if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
			}
		},

		// filters out duplicates and extends all nodes
		unique: function(nodes) {
			if (nodes.length == 0) return nodes;
			var results = [], n;
			for (var i = 0, l = nodes.length; i < l; i++)
				if (!(n = nodes[i])._countedByPrototype) {
				n._countedByPrototype = Prototype.emptyFunction;
				results.push(Element.extend(n));
			}
			return Selector.handlers.unmark(results);
		},

		// COMBINATOR FUNCTIONS
		descendant: function(nodes) {
			var h = Selector.handlers;
			for (var i = 0, results = [], node; node = nodes[i]; i++)
				h.concat(results, node.getElementsByTagName('*'));
			return results;
		},

		child: function(nodes) {
			var h = Selector.handlers;
			for (var i = 0, results = [], node; node = nodes[i]; i++) {
				for (var j = 0, child; child = node.childNodes[j]; j++)
					if (child.nodeType == 1 && child.tagName != '!') results.push(child);
			}
			return results;
		},

		adjacent: function(nodes) {
			for (var i = 0, results = [], node; node = nodes[i]; i++) {
				var next = this.nextElementSibling(node);
				if (next) results.push(next);
			}
			return results;
		},

		laterSibling: function(nodes) {
			var h = Selector.handlers;
			for (var i = 0, results = [], node; node = nodes[i]; i++)
				h.concat(results, Element.nextSiblings(node));
			return results;
		},

		nextElementSibling: function(node) {
			while (node = node.nextSibling)
				if (node.nodeType == 1) return node;
			return null;
		},

		previousElementSibling: function(node) {
			while (node = node.previousSibling)
				if (node.nodeType == 1) return node;
			return null;
		},

		// TOKEN FUNCTIONS
		tagName: function(nodes, root, tagName, combinator) {
			var uTagName = tagName.toUpperCase();
			var results = [], h = Selector.handlers;
			if (nodes) {
				if (combinator) {
					// fastlane for ordinary descendant combinators
					if (combinator == "descendant") {
						for (var i = 0, node; node = nodes[i]; i++)
							h.concat(results, node.getElementsByTagName(tagName));
						return results;
					} else nodes = this[combinator](nodes);
					if (tagName == "*") return nodes;
				}
				for (var i = 0, node; node = nodes[i]; i++)
					if (node.tagName.toUpperCase() === uTagName) results.push(node);
				return results;
			} else return root.getElementsByTagName(tagName);
		},

		id: function(nodes, root, id, combinator) {
			var targetNode = $(id), h = Selector.handlers;
			if (!targetNode) return [];
			if (!nodes && root == document) return [targetNode];
			if (nodes) {
				if (combinator) {
					if (combinator == 'child') {
						for (var i = 0, node; node = nodes[i]; i++)
							if (targetNode.parentNode == node) return [targetNode];
					} else if (combinator == 'descendant') {
						for (var i = 0, node; node = nodes[i]; i++)
							if (Element.descendantOf(targetNode, node)) return [targetNode];
					} else if (combinator == 'adjacent') {
						for (var i = 0, node; node = nodes[i]; i++)
							if (Selector.handlers.previousElementSibling(targetNode) == node)
							return [targetNode];
					} else nodes = h[combinator](nodes);
				}
				for (var i = 0, node; node = nodes[i]; i++)
					if (node == targetNode) return [targetNode];
				return [];
			}
			return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
		},

		className: function(nodes, root, className, combinator) {
			if (nodes && combinator) nodes = this[combinator](nodes);
			return Selector.handlers.byClassName(nodes, root, className);
		},

		byClassName: function(nodes, root, className) {
			if (!nodes) nodes = Selector.handlers.descendant([root]);
			var needle = ' ' + className + ' ';
			for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
				nodeClassName = node.className;
				if (nodeClassName.length == 0) continue;
				if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
					results.push(node);
			}
			return results;
		},

		attrPresence: function(nodes, root, attr, combinator) {
			if (!nodes) nodes = root.getElementsByTagName("*");
			if (nodes && combinator) nodes = this[combinator](nodes);
			var results = [];
			for (var i = 0, node; node = nodes[i]; i++)
				if (Element.hasAttribute(node, attr)) results.push(node);
			return results;
		},

		attr: function(nodes, root, attr, value, operator, combinator) {
			if (!nodes) nodes = root.getElementsByTagName("*");
			if (nodes && combinator) nodes = this[combinator](nodes);
			var handler = Selector.operators[operator], results = [];
			for (var i = 0, node; node = nodes[i]; i++) {
				var nodeValue = Element.readAttribute(node, attr);
				if (nodeValue === null) continue;
				if (handler(nodeValue, value)) results.push(node);
			}
			return results;
		},

		pseudo: function(nodes, name, value, root, combinator) {
			if (nodes && combinator) nodes = this[combinator](nodes);
			if (!nodes) nodes = root.getElementsByTagName("*");
			return Selector.pseudos[name](nodes, value, root);
		}
	},

	pseudos: {
		'first-child': function(nodes, value, root) {
			for (var i = 0, results = [], node; node = nodes[i]; i++) {
				if (Selector.handlers.previousElementSibling(node)) continue;
				results.push(node);
			}
			return results;
		},
		'last-child': function(nodes, value, root) {
			for (var i = 0, results = [], node; node = nodes[i]; i++) {
				if (Selector.handlers.nextElementSibling(node)) continue;
				results.push(node);
			}
			return results;
		},
		'only-child': function(nodes, value, root) {
			var h = Selector.handlers;
			for (var i = 0, results = [], node; node = nodes[i]; i++)
				if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
				results.push(node);
			return results;
		},
		'nth-child': function(nodes, formula, root) {
			return Selector.pseudos.nth(nodes, formula, root);
		},
		'nth-last-child': function(nodes, formula, root) {
			return Selector.pseudos.nth(nodes, formula, root, true);
		},
		'nth-of-type': function(nodes, formula, root) {
			return Selector.pseudos.nth(nodes, formula, root, false, true);
		},
		'nth-last-of-type': function(nodes, formula, root) {
			return Selector.pseudos.nth(nodes, formula, root, true, true);
		},
		'first-of-type': function(nodes, formula, root) {
			return Selector.pseudos.nth(nodes, "1", root, false, true);
		},
		'last-of-type': function(nodes, formula, root) {
			return Selector.pseudos.nth(nodes, "1", root, true, true);
		},
		'only-of-type': function(nodes, formula, root) {
			var p = Selector.pseudos;
			return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
		},

		// handles the an+b logic
		getIndices: function(a, b, total) {
			if (a == 0) return b > 0 ? [b] : [];
			return $R(1, total).inject([], function(memo, i) {
				if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
				return memo;
			});
		},

		// handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
		nth: function(nodes, formula, root, reverse, ofType) {
			if (nodes.length == 0) return [];
			if (formula == 'even') formula = '2n+0';
			if (formula == 'odd') formula = '2n+1';
			var h = Selector.handlers, results = [], indexed = [], m;
			h.mark(nodes);
			for (var i = 0, node; node = nodes[i]; i++) {
				if (!node.parentNode._countedByPrototype) {
					h.index(node.parentNode, reverse, ofType);
					indexed.push(node.parentNode);
				}
			}
			if (formula.match(/^\d+$/)) { // just a number
				formula = Number(formula);
				for (var i = 0, node; node = nodes[i]; i++)
					if (node.nodeIndex == formula) results.push(node);
			} else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
				if (m[1] == "-") m[1] = -1;
				var a = m[1] ? Number(m[1]) : 1;
				var b = m[2] ? Number(m[2]) : 0;
				var indices = Selector.pseudos.getIndices(a, b, nodes.length);
				for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
					for (var j = 0; j < l; j++)
						if (node.nodeIndex == indices[j]) results.push(node);
				}
			}
			h.unmark(nodes);
			h.unmark(indexed);
			return results;
		},

		'empty': function(nodes, value, root) {
			for (var i = 0, results = [], node; node = nodes[i]; i++) {
				// IE treats comments as element nodes
				if (node.tagName == '!' || node.firstChild) continue;
				results.push(node);
			}
			return results;
		},

		'not': function(nodes, selector, root) {
			var h = Selector.handlers, selectorType, m;
			var exclusions = new Selector(selector).findElements(root);
			h.mark(exclusions);
			for (var i = 0, results = [], node; node = nodes[i]; i++)
				if (!node._countedByPrototype) results.push(node);
			h.unmark(exclusions);
			return results;
		},

		'enabled': function(nodes, value, root) {
			for (var i = 0, results = [], node; node = nodes[i]; i++)
				if (!node.disabled && (!node.type || node.type !== 'hidden'))
				results.push(node);
			return results;
		},

		'disabled': function(nodes, value, root) {
			for (var i = 0, results = [], node; node = nodes[i]; i++)
				if (node.disabled) results.push(node);
			return results;
		},

		'checked': function(nodes, value, root) {
			for (var i = 0, results = [], node; node = nodes[i]; i++)
				if (node.checked) results.push(node);
			return results;
		}
	},

	operators: {
		'=': function(nv, v) { return nv == v; },
		'!=': function(nv, v) { return nv != v; },
		'^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
		'$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
		'*=': function(nv, v) { return nv == v || nv && nv.include(v); },
		'$=': function(nv, v) { return nv.endsWith(v); },
		'*=': function(nv, v) { return nv.include(v); },
		'~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
		'|=': function(nv, v) {
			return ('-' + (nv || "").toUpperCase() +
     '-').include('-' + (v || "").toUpperCase() + '-');
		}
	},

	split: function(expression) {
		var expressions = [];
		expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
			expressions.push(m[1].strip());
		});
		return expressions;
	},

	matchElements: function(elements, expression) {
		var matches = $$(expression), h = Selector.handlers;
		h.mark(matches);
		for (var i = 0, results = [], element; element = elements[i]; i++)
			if (element._countedByPrototype) results.push(element);
		h.unmark(matches);
		return results;
	},

	findElement: function(elements, expression, index) {
		if (Object.isNumber(expression)) {
			index = expression; expression = false;
		}
		return Selector.matchElements(elements, expression || '*')[index || 0];
	},

	findChildElements: function(element, expressions) {
		expressions = Selector.split(expressions.join(','));
		var results = [], h = Selector.handlers;
		for (var i = 0, l = expressions.length, selector; i < l; i++) {
			selector = new Selector(expressions[i].strip());
			h.concat(results, selector.findElements(element));
		}
		return (l > 1) ? h.unique(results) : results;
	}
});

if (Prototype.Browser.IE) {
	Object.extend(Selector.handlers, {
		// IE returns comment nodes on getElementsByTagName("*").
		// Filter them out.
		concat: function(a, b) {
			for (var i = 0, node; node = b[i]; i++)
				if (node.tagName !== "!") a.push(node);
			return a;
		},

		// IE improperly serializes _countedByPrototype in (inner|outer)HTML.
		unmark: function(nodes) {
			for (var i = 0, node; node = nodes[i]; i++)
				node.removeAttribute('_countedByPrototype');
			return nodes;
		}
	});
}

function $$() {
	return Selector.findChildElements(document, $A(arguments));
}
var Form = {
	reset: function(form) {
		$(form).reset();
		return form;
	},

	serializeElements: function(elements, options) {
		if (typeof options != 'object') options = { hash: !!options };
		else if (Object.isUndefined(options.hash)) options.hash = true;
		var key, value, submitted = false, submit = options.submit;

		var data = elements.inject({}, function(result, element) {
			if (!element.disabled && element.name) {
				key = element.name; value = $(element).getValue();
				if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
					if (key in result) {
						// a key is already present; construct an array of values
						if (!Object.isArray(result[key])) result[key] = [result[key]];
						result[key].push(value);
					}
					else result[key] = value;
				}
			}
			return result;
		});

		return options.hash ? data : Object.toQueryString(data);
	}
};

Form.Methods = {
	serialize: function(form, options) {
		return Form.serializeElements(Form.getElements(form), options);
	},

	getElements: function(form) {
		return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child) {
      	if (Form.Element.Serializers[child.tagName.toLowerCase()])
      		elements.push(Element.extend(child));
      	return elements;
      }
    );
	},

	getInputs: function(form, typeName, name) {
		form = $(form);
		var inputs = form.getElementsByTagName('input');

		if (!typeName && !name) return $A(inputs).map(Element.extend);

		for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
			var input = inputs[i];
			if ((typeName && input.type != typeName) || (name && input.name != name))
				continue;
			matchingInputs.push(Element.extend(input));
		}

		return matchingInputs;
	},

	disable: function(form) {
		form = $(form);
		Form.getElements(form).invoke('disable');
		return form;
	},

	enable: function(form) {
		form = $(form);
		Form.getElements(form).invoke('enable');
		return form;
	},

	findFirstElement: function(form) {
		var elements = $(form).getElements().findAll(function(element) {
			return 'hidden' != element.type && !element.disabled;
		});
		var firstByIndex = elements.findAll(function(element) {
			return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
		}).sortBy(function(element) { return element.tabIndex }).first();

		return firstByIndex ? firstByIndex : elements.find(function(element) {
			return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
		});
	},

	focusFirstElement: function(form) {
		form = $(form);
		form.findFirstElement().activate();
		return form;
	},

	request: function(form, options) {
		form = $(form), options = Object.clone(options || {});

		var params = options.parameters, action = form.readAttribute('action') || '';
		if (action.blank()) action = window.location.href;
		options.parameters = form.serialize(true);

		if (params) {
			if (Object.isString(params)) params = params.toQueryParams();
			Object.extend(options.parameters, params);
		}

		if (form.hasAttribute('method') && !options.method)
			options.method = form.method;

		return new Ajax.Request(action, options);
	}
};

/*--------------------------------------------------------------------------*/

Form.Element = {
	focus: function(element) {
		$(element).focus();
		return element;
	},

	select: function(element) {
		$(element).select();
		return element;
	}
};

Form.Element.Methods = {
	serialize: function(element) {
		element = $(element);
		if (!element.disabled && element.name) {
			var value = element.getValue();
			if (value != undefined) {
				var pair = {};
				pair[element.name] = value;
				return Object.toQueryString(pair);
			}
		}
		return '';
	},

	getValue: function(element) {
		element = $(element);
		var method = element.tagName.toLowerCase();
		return Form.Element.Serializers[method](element);
	},

	setValue: function(element, value) {
		element = $(element);
		var method = element.tagName.toLowerCase();
		Form.Element.Serializers[method](element, value);
		return element;
	},

	clear: function(element) {
		$(element).value = '';
		return element;
	},

	present: function(element) {
		return $(element).value != '';
	},

	activate: function(element) {
		element = $(element);
		try {
			element.focus();
			if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'reset', 'submit'].include(element.type)))
				element.select();
		} catch (e) { }
		return element;
	},

	disable: function(element) {
		element = $(element);
		element.disabled = true;
		return element;
	},

	enable: function(element) {
		element = $(element);
		element.disabled = false;
		return element;
	}
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
	input: function(element, value) {
		switch (element.type.toLowerCase()) {
			case 'checkbox':
			case 'radio':
				return Form.Element.Serializers.inputSelector(element, value);
			default:
				return Form.Element.Serializers.textarea(element, value);
		}
	},

	inputSelector: function(element, value) {
		if (Object.isUndefined(value)) return element.checked ? element.value : null;
		else element.checked = !!value;
	},

	textarea: function(element, value) {
		if (Object.isUndefined(value)) return element.value;
		else element.value = value;
	},

	select: function(element, value) {
		if (Object.isUndefined(value))
			return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
		else {
			var opt, currentValue, single = !Object.isArray(value);
			for (var i = 0, length = element.length; i < length; i++) {
				opt = element.options[i];
				currentValue = this.optionValue(opt);
				if (single) {
					if (currentValue == value) {
						opt.selected = true;
						return;
					}
				}
				else opt.selected = value.include(currentValue);
			}
		}
	},

	selectOne: function(element) {
		var index = element.selectedIndex;
		return index >= 0 ? this.optionValue(element.options[index]) : null;
	},

	selectMany: function(element) {
		var values, length = element.length;
		if (!length) return null;

		for (var i = 0, values = []; i < length; i++) {
			var opt = element.options[i];
			if (opt.selected) values.push(this.optionValue(opt));
		}
		return values;
	},

	optionValue: function(opt) {
		// extend element because hasAttribute may not be native
		return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
	}
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
	initialize: function($super, element, frequency, callback) {
		$super(callback, frequency);
		this.element = $(element);
		this.lastValue = this.getValue();
	},

	execute: function() {
		var value = this.getValue();
		if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
			this.callback(this.element, value);
			this.lastValue = value;
		}
	}
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
	getValue: function() {
		return Form.Element.getValue(this.element);
	}
});

Form.Observer = Class.create(Abstract.TimedObserver, {
	getValue: function() {
		return Form.serialize(this.element);
	}
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
	initialize: function(element, callback) {
		this.element = $(element);
		this.callback = callback;

		this.lastValue = this.getValue();
		if (this.element.tagName.toLowerCase() == 'form')
			this.registerFormCallbacks();
		else
			this.registerCallback(this.element);
	},

	onElementEvent: function() {
		var value = this.getValue();
		if (this.lastValue != value) {
			this.callback(this.element, value);
			this.lastValue = value;
		}
	},

	registerFormCallbacks: function() {
		Form.getElements(this.element).each(this.registerCallback, this);
	},

	registerCallback: function(element) {
		if (element.type) {
			switch (element.type.toLowerCase()) {
				case 'checkbox':
				case 'radio':
					Event.observe(element, 'click', this.onElementEvent.bind(this));
					break;
				default:
					Event.observe(element, 'change', this.onElementEvent.bind(this));
					break;
			}
		}
	}
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
	getValue: function() {
		return Form.Element.getValue(this.element);
	}
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
	getValue: function() {
		return Form.serialize(this.element);
	}
});
if (!window.Event) var Event = {};

Object.extend(Event, {
	KEY_BACKSPACE: 8,
	KEY_TAB: 9,
	KEY_RETURN: 13,
	KEY_ESC: 27,
	KEY_LEFT: 37,
	KEY_UP: 38,
	KEY_RIGHT: 39,
	KEY_DOWN: 40,
	KEY_DELETE: 46,
	KEY_HOME: 36,
	KEY_END: 35,
	KEY_PAGEUP: 33,
	KEY_PAGEDOWN: 34,
	KEY_INSERT: 45,

	cache: {},

	relatedTarget: function(event) {
		var element;
		switch (event.type) {
			case 'mouseover': element = event.fromElement; break;
			case 'mouseout': element = event.toElement; break;
			default: return null;
		}
		return Element.extend(element);
	}
});

Event.Methods = (function() {
	var isButton;

	if (Prototype.Browser.IE) {
		var buttonMap = { 0: 1, 1: 4, 2: 2 };
		isButton = function(event, code) {
			return event.button == buttonMap[code];
		};

	} else if (Prototype.Browser.WebKit) {
		isButton = function(event, code) {
			switch (code) {
				case 0: return event.which == 1 && !event.metaKey;
				case 1: return event.which == 1 && event.metaKey;
				default: return false;
			}
		};

	} else {
		isButton = function(event, code) {
			return event.which ? (event.which === code + 1) : (event.button === code);
		};
	}

	return {
		isLeftClick: function(event) { return isButton(event, 0) },
		isMiddleClick: function(event) { return isButton(event, 1) },
		isRightClick: function(event) { return isButton(event, 2) },

		element: function(event) {
			event = Event.extend(event);

			var node = event.target,
          type = event.type,
          currentTarget = event.currentTarget;

			if (currentTarget && currentTarget.tagName) {
				// Firefox screws up the "click" event when moving between radio buttons
				// via arrow keys. It also screws up the "load" and "error" events on images,
				// reporting the document as the target instead of the original image.
				if (type === 'load' || type === 'error' ||
          (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
            && currentTarget.type === 'radio'))
					node = currentTarget;
			}
			if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
			return Element.extend(node);
		},

		findElement: function(event, expression) {
			var element = Event.element(event);
			if (!expression) return element;
			var elements = [element].concat(element.ancestors());
			return Selector.findElement(elements, expression, 0);
		},

		pointer: function(event) {
			var docElement = document.documentElement,
      body = document.body || { scrollLeft: 0, scrollTop: 0 };
			return {
				x: event.pageX || (event.clientX +
          (docElement.scrollLeft || body.scrollLeft) -
          (docElement.clientLeft || 0)),
				y: event.pageY || (event.clientY +
          (docElement.scrollTop || body.scrollTop) -
          (docElement.clientTop || 0))
			};
		},

		pointerX: function(event) { return Event.pointer(event).x },
		pointerY: function(event) { return Event.pointer(event).y },

		stop: function(event) {
			Event.extend(event);
			event.preventDefault();
			event.stopPropagation();
			event.stopped = true;
		}
	};
})();

Event.extend = (function() {
	var methods = Object.keys(Event.Methods).inject({}, function(m, name) {
		m[name] = Event.Methods[name].methodize();
		return m;
	});

	if (Prototype.Browser.IE) {
		Object.extend(methods, {
			stopPropagation: function() { this.cancelBubble = true },
			preventDefault: function() { this.returnValue = false },
			inspect: function() { return "[object Event]" }
		});

		return function(event) {
			if (!event) return false;
			if (event._extendedByPrototype) return event;

			event._extendedByPrototype = Prototype.emptyFunction;
			var pointer = Event.pointer(event);
			Object.extend(event, {
				target: event.srcElement,
				relatedTarget: Event.relatedTarget(event),
				pageX: pointer.x,
				pageY: pointer.y
			});
			return Object.extend(event, methods);
		};

	} else {
		Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
		Object.extend(Event.prototype, methods);
		return Prototype.K;
	}
})();

Object.extend(Event, (function() {
	var cache = Event.cache;

	function getEventID(element) {
		if (element._prototypeEventID) return element._prototypeEventID[0];
		arguments.callee.id = arguments.callee.id || 1;
		return element._prototypeEventID = [++arguments.callee.id];
	}

	function getDOMEventName(eventName) {
		if (eventName && eventName.include(':')) return "dataavailable";
		return eventName;
	}

	function getCacheForID(id) {
		return cache[id] = cache[id] || {};
	}

	function getWrappersForEventName(id, eventName) {
		var c = getCacheForID(id);
		return c[eventName] = c[eventName] || [];
	}

	function createWrapper(element, eventName, handler) {
		var id = getEventID(element);
		var c = getWrappersForEventName(id, eventName);
		if (c.pluck("handler").include(handler)) return false;

		var wrapper = function(event) {
			if (!Event || !Event.extend ||
        (event.eventName && event.eventName != eventName))
				return false;

			Event.extend(event);
			handler.call(element, event);
		};

		wrapper.handler = handler;
		c.push(wrapper);
		return wrapper;
	}

	function findWrapper(id, eventName, handler) {
		var c = getWrappersForEventName(id, eventName);
		return c.find(function(wrapper) { return wrapper.handler == handler });
	}

	function destroyWrapper(id, eventName, handler) {
		var c = getCacheForID(id);
		if (!c[eventName]) return false;
		c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
	}

	function destroyCache() {
		for (var id in cache)
			for (var eventName in cache[id])
			cache[id][eventName] = null;
	}


	// Internet Explorer needs to remove event handlers on page unload
	// in order to avoid memory leaks.
	if (window.attachEvent) {
		window.attachEvent("onunload", destroyCache);
	}

	// Safari has a dummy event handler on page unload so that it won't
	// use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
	// object when page is returned to via the back button using its bfcache.
	if (Prototype.Browser.WebKit) {
		window.addEventListener('unload', Prototype.emptyFunction, false);
	}

	return {
		observe: function(element, eventName, handler) {
			element = $(element);
			var name = getDOMEventName(eventName);

			var wrapper = createWrapper(element, eventName, handler);
			if (!wrapper) return element;

			if (element.addEventListener) {
				element.addEventListener(name, wrapper, false);
			} else {
				element.attachEvent("on" + name, wrapper);
			}

			return element;
		},

		stopObserving: function(element, eventName, handler) {
			element = $(element);
			var id = getEventID(element), name = getDOMEventName(eventName);

			if (!handler && eventName) {
				getWrappersForEventName(id, eventName).each(function(wrapper) {
					element.stopObserving(eventName, wrapper.handler);
				});
				return element;

			} else if (!eventName) {
				Object.keys(getCacheForID(id)).each(function(eventName) {
					element.stopObserving(eventName);
				});
				return element;
			}

			var wrapper = findWrapper(id, eventName, handler);
			if (!wrapper) return element;

			if (element.removeEventListener) {
				element.removeEventListener(name, wrapper, false);
			} else {
				element.detachEvent("on" + name, wrapper);
			}

			destroyWrapper(id, eventName, handler);

			return element;
		},

		fire: function(element, eventName, memo) {
			element = $(element);
			if (element == document && document.createEvent && !element.dispatchEvent)
				element = document.documentElement;

			var event;
			if (document.createEvent) {
				event = document.createEvent("HTMLEvents");
				event.initEvent("dataavailable", true, true);
			} else {
				event = document.createEventObject();
				event.eventType = "ondataavailable";
			}

			event.eventName = eventName;
			event.memo = memo || {};

			if (document.createEvent) {
				element.dispatchEvent(event);
			} else {
				element.fireEvent(event.eventType, event);
			}

			return Event.extend(event);
		}
	};
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
	fire: Event.fire,
	observe: Event.observe,
	stopObserving: Event.stopObserving
});

Object.extend(document, {
	fire: Element.Methods.fire.methodize(),
	observe: Element.Methods.observe.methodize(),
	stopObserving: Element.Methods.stopObserving.methodize(),
	loaded: false
});

(function() {
	/* Support for the DOMContentLoaded event is based on work by Dan Webb,
	Matthias Miller, Dean Edwards and John Resig. */

	var timer;

	function fireContentLoadedEvent() {
		if (document.loaded) return;
		if (timer) window.clearInterval(timer);
		document.fire("dom:loaded");
		document.loaded = true;
	}

	if (document.addEventListener) {
		if (Prototype.Browser.WebKit) {
			timer = window.setInterval(function() {
				if (/loaded|complete/.test(document.readyState))
					fireContentLoadedEvent();
			}, 0);

			Event.observe(window, "load", fireContentLoadedEvent);

		} else {
			document.addEventListener("DOMContentLoaded",
        fireContentLoadedEvent, false);
		}

	} else {
		document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
		$("__onDOMContentLoaded").onreadystatechange = function() {
			if (this.readyState == "complete") {
				this.onreadystatechange = null;
				fireContentLoadedEvent();
			}
		};
	}
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
	Before: function(element, content) {
		return Element.insert(element, { before: content });
	},

	Top: function(element, content) {
		return Element.insert(element, { top: content });
	},

	Bottom: function(element, content) {
		return Element.insert(element, { bottom: content });
	},

	After: function(element, content) {
		return Element.insert(element, { after: content });
	}
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
	// set to true if needed, warning: firefox performance problems
	// NOT neeeded for page scrolling, only if draggable contained in
	// scrollable elements
	includeScrollOffsets: false,

	// must be called before calling withinIncludingScrolloffset, every time the
	// page is scrolled
	prepare: function() {
		this.deltaX = window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
		this.deltaY = window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
	},

	// caches x/y coordinate pair to use with overlap
	within: function(element, x, y) {
		if (this.includeScrollOffsets)
			return this.withinIncludingScrolloffsets(element, x, y);
		this.xcomp = x;
		this.ycomp = y;
		this.offset = Element.cumulativeOffset(element);

		return (y >= this.offset[1] &&
            y < this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x < this.offset[0] + element.offsetWidth);
	},

	withinIncludingScrolloffsets: function(element, x, y) {
		var offsetcache = Element.cumulativeScrollOffset(element);

		this.xcomp = x + offsetcache[0] - this.deltaX;
		this.ycomp = y + offsetcache[1] - this.deltaY;
		this.offset = Element.cumulativeOffset(element);

		return (this.ycomp >= this.offset[1] &&
            this.ycomp < this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp < this.offset[0] + element.offsetWidth);
	},

	// within must be called directly before
	overlap: function(mode, element) {
		if (!mode) return 0;
		if (mode == 'vertical')
			return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
		if (mode == 'horizontal')
			return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
	},

	// Deprecation layer -- use newer Element methods now (1.5.2).

	cumulativeOffset: Element.Methods.cumulativeOffset,

	positionedOffset: Element.Methods.positionedOffset,

	absolutize: function(element) {
		Position.prepare();
		return Element.absolutize(element);
	},

	relativize: function(element) {
		Position.prepare();
		return Element.relativize(element);
	},

	realOffset: Element.Methods.cumulativeScrollOffset,

	offsetParent: Element.Methods.getOffsetParent,

	page: Element.Methods.viewportOffset,

	clone: function(source, target, options) {
		options = options || {};
		return Element.clonePosition(target, source, options);
	}
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods) {
	function iter(name) {
		return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
	}

	instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
  	className = className.toString().strip();
  	var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
  	return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
  	className = className.toString().strip();
  	var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
  	if (!classNames && !className) return elements;

  	var nodes = $(element).getElementsByTagName('*');
  	className = ' ' + className + ' ';

  	for (var i = 0, child, cn; child = nodes[i]; i++) {
  		if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
          	return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
  			elements.push(Element.extend(child));
  	}
  	return elements;
  };

	return function(className, parentElement) {
		return $(parentElement || document.body).getElementsByClassName(className);
	};
} (Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
	initialize: function(element) {
		this.element = $(element);
	},

	_each: function(iterator) {
		this.element.className.split(/\s+/).select(function(name) {
			return name.length > 0;
		})._each(iterator);
	},

	set: function(className) {
		this.element.className = className;
	},

	add: function(classNameToAdd) {
		if (this.include(classNameToAdd)) return;
		this.set($A(this).concat(classNameToAdd).join(' '));
	},

	remove: function(classNameToRemove) {
		if (!this.include(classNameToRemove)) return;
		this.set($A(this).without(classNameToRemove).join(' '));
	},

	toString: function() {
		return $A(this).join(' ');
	}
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();